Specifications

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440 01 1024 04
Specifications are subject to change without notice
Table 11
NATURAL GAS MANIFOLD PRESSURE (in wc)
FOR THE 40k, 60k & 80k BTUH MODEL AND ALTERNATE INPUT MODELS 20,000 BTU per burner
HEATING
VALUE
at ALTITUDE
BTU/CU. FT.
MEAN ELEVATION ABOVE SEA LEVEL − ft(m)
0 to 2000
(0 to 609.6)
2001 to 3000*
(609.9 to 914.4)*
3001 to 4000
(914.7 to 1219.2)
4001 to 5000
(1219.5 to 1524)
5001 to 6000
(1524.3 to 1828.8)
6001 to 7000
(1829.1 to 2133.6)
7001 to 8000
(2133.9 to 2438.4)
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
Orifice
No.
Manifold
Pressure
700 −− −− −− −− −− −− −− −− −− −− −− −− 42 3.6
725 −− −− −− −− −− −− −− −− −− −− 42 3.5 42 3.4
750 −− −− −− −− −− −− −− −− −− −− 42 3.3 42 3.2
775 −− −− −− −− −− −− −− −− 41 2.9 43 3.7 43 3.6
800 −− −− −− −− −− −− 42 3.1 43 3.6 43 3.5 43 3.4
825 −− −− −− −− 43 3.7 43 3.6 43 3.4 43 3.3 44 3.6
850 −− −− −− −− 43 3.5 43 3.4 44 3.7 44 3.6 44 3.4
875 −− −− 43 3.4 43 3.3 44 3.6 44 3.5 44 3.4 44 3.2
900 −− −− 44 3.7 44 3.6 44 3.4 44 3.3 44 3.2 44 3.1
925 44 3.7 44 3.5 44 3.4 44 3.2 44 3.1 45 3.6 45 3.5
950 44 3.5 44 3.3 44 3.2 44 3.1 45 3.6 45 3.5 45 3.3
975 44 3.3 44 3.1 45 3.7 45 3.5 45 3.4 45 3.3 45 3.2
1000 44 3.2 45 3.6 45 3.5 45 3.4 45 3.2 45 3.1 46 3.1
1050 46 3.6 45 3.3 45 3.2 45 3.1 46 3.1 −− −− −− −−
1100 46 3.3 45 3.0 46 3.0 46 2.9 −− −− −− −− −− −−
Conversion: 1 in wc = .25kPa
NOTE: Natural gas data is based on 0.60 specific gravity. For fuels with different specific gravity consult the National Fuel Gas Code ANSI Z223.1/NFPA
54−2009 or National Standard of Canada, Natural Gas And Propane Installation Code CSA B149.1−05.
* In the USA, derating of these furnaces at 2% (Natural Gas) and 4% (Propane Gas) has been tested and design−certified by CSA.
In Canada, the input rating must be derated 5% (Natural Gas) and 10% (Propane Gas) for altitudes of 2,000 to 4,500 (609.6 to
1371.6m) above sea level. Use the 2001 to 3000 (609.9 to 914.4m) column in Table 9, Table 10, Table 11 and Table 12.
Table 12
PROPANE GAS MANIFOLD PRESSURE (in wc)
FOR THE 40k, 60k & 80k BTUH MODEL AND ALTERNATE INPUT MODELS 20,000 BTU per burner
HEATING VALUE
at ALTITUDE
BTU/CU. FT.
MEAN ELEVATION ABOVE SEA LEVEL − ft(m)
0 to 2000
(0 to 609.6)
2001 to 3000*
(609.9 to 914.4)*
3001 to 4000
(914.7 to 1219.2)
4001 to 5000
(1219.5 to 1524)
5001 to 6000
(1524.3 to 1828.8)
6001 to 7000
(1829.1 to 2133.6)
7001 to 8000
(2133.9 to 2438.4)
2500 10.0 8.9 8.4 10.0 10.0 10.0 10.0
Orifice Size #55 #55 #55 #56 #56 #56 #56
Conversion: 1 in wc = .25 kPa
NOTE: Propane data is based on 1.53 specific gravity. For fuels with different specific gravity consult the National Fuel Gas Code ANSI Z223.1/NFPA
54−2009 or National Standard Of Canada, Natural Gas And Propane Installation Code CSA B149.1−05.
* In the USA, derating of these furnaces at 2% (Natural Gas) and 4% (Propane Gas) has been tested and design−certified by CSA.
In Canada, the input rating must be derated 5% (Natural Gas) and 10% (Propane Gas) for altitudes of 2,000 to 4,500 (609.6 to
1371.6m) above sea level. Use the 2001 to 3000 (609.9 to 914.4m) column in Table 9, Table 10, Table 11 and Table 12.
The burner orifice part nos. are as follows:
Orifice
Part # Orifice Part #
41 1096942 42 1011351
43 1011377 44 1011352
45 1011353 46 1011744
47 1011378 48 1113201
49 1113202 54 1011376
55 1011354 56 1011355
General Derating Rules
1. These furnaces may be used at full input rating when
installed at altitudes up to 2,000′ (609.6m). When installed
above 2,000′ (609.6m), the input must be decreased 2%
(natural) or 4% (Propane) for each 1000′ (304.8m) above
sea level in the USA. In Canada, the input rating must be
derated 5% (natural) or 10% (Propane) for each 1000′
(304.8m) above sea level. See Table 11 or Table 12 for
required high altitude input rate.
2. For operation with natural gas at altitudes above 2,000′
(609.6m), orifice change and/or manifold pressure
adjustments may be required for the gas supplied. First
consult your local gas supplier, then refer to Table 9 for
required pressure change and/or orifice change for high
altitudes.
3. For operation with Propane gas, gas orifices MUST be
changed and manifold pressure MUST be maintained as
per Table 10. Orifices can be ordered through our
distributor. (See Figure 33)